Charles anderson



(N0 Mo 0. ANDERSON.

PLOW POINT. No. 592,858. Patented Nov. 2, 1897.

Jim

feigovfff W UNITED STATES PATENT OFFICE.

CHARLES ANDERSON, OF SOUTH BEND, INDIANA, ASSIGNOR TO THE SOUTH BEND IRON WORKS, OFSAME PLACE.

PLOW-POINT.

SPECIFICATION forming part of Letters Patent No. 592,858, dated November 2, 1897.

Application filed March 13 1897.

To aZZ whom it may concern.-

Be it known that I, CHARLES ANDERSON, a resident of South Bend, in the county of St. Joseph and State of Indiana, have invented. certain new and useful Improvements 'in Plow-Points and. I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in plow-points, the object being to economize in the manufacture, thereby decreasing the initial expense of production, and turn out a more durable and efficient article of manufacture.

In the accompanying drawings, Figure 1 is wears back it retains its same cutting quali ties until the blade is worn up to the body of the point. On this concaved surface parallel ribs 2 2 are formed. Now it will be seen that the point of a plow wears away the fastest at the cutting edge or blade, where it pushes its way through the unbroken ground. By providing these ribs this comparatively thin selfsharpening edge is strengthened and reinforced and caused to scour perfectly, the soil following the direction of the ribs and. grooves, leaving a bright and shining surface. In this way the blade or cutting-edge portion is stronger than if thicker, and it has the superior quality which the thin edge possesses of self-sharpenin g until it becomes entirely worn away. This wearing is even. It is upon the blade portion and likewise upon the ribs, and the same uniformity of strength is preserved throughout the entire life of the point.

Hitherto longitudinal ribs have been formed on the under surface of the plow-point. These ribs have stopped a little short of the extreme edge-say three sixteenths back from the edge. This margin only was chilled, and the idea was that the chilled margin should wear away after a few days use,

Serial No. 627,367. (No model.)

whereupon a serrated cutting edge would be formed; but there are two manifest objections present in said invention which my construction obviates. These are, first, that whatever gums up or sticks to the under side of a point always remains there, and when there are ribs and grooves this tendency is only aggravated, because there is absolutely no friction at that point to Wear the accumulating material away, and with'the ribs and grooves it only sticks the more tenaciously. Again, the margin is the only portion which is chilled and made hard. In my own invention I place my ribs for a diiferent purpose-namely, to give strength, not to form teeth or serrations- -and to prevent clogging and. adhesion of foreign substances they are located where there is constant friction-to wit, on the top surface-so that I provide a comparatively thin edge, which I make strong by the employment of the ribs at a point where they will not cause gumming and clogging of the plow.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A plow-point constructed .with a smooth flat lower surface and provided on its upper surface with parallel strengthening-ribs, the cutting edge being made thin and its extreme forward edge made practically straight and without serrations and indentations, andthe upper surface of the cutting edge of the point being chilled, substantially as set forth.

2. A plow-point constructed with a smooth flat lower surface and provided with a comparatively wide thin cutting edge having parallel strengthening ribs on its upper surface,

'saidribs being gradually diminished in thick ness at their opposite ends, the point having its cutting edge chilled through and through, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscrib ing witnesses.

CHARLES ANDERSON.

Witnessesi EDWIN NIGAR, JNo. W. HARBAN. 

